Comparative Photo-Electrochemical and Photocatalytic Studies with Nanosized TiO2 Photocatalysts towards Organic Pollutants Oxidation
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http://hdl.handle.net/10045/113628
Títol: | Comparative Photo-Electrochemical and Photocatalytic Studies with Nanosized TiO2 Photocatalysts towards Organic Pollutants Oxidation |
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Autors: | Monllor-Satoca, Damián | Bonete, Pedro | Djellabi, Ridha | Cerrato, Giuseppina | Operti, Lorenza | Gómez, Roberto | Bianchi, Claudia Letizia |
Grups d'investigació o GITE: | Grupo de Fotoquímica y Electroquímica de Semiconductores (GFES) |
Centre, Departament o Servei: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica |
Paraules clau: | Nanosized TiO2 | Photocatalytic efficiency | Photo-electrochemical characterization | Environmental remediation |
Àrees de coneixement: | Química Física |
Data de publicació: | 9-de març-2021 |
Editor: | MDPI |
Citació bibliogràfica: | Monllor-Satoca D, Bonete P, Djellabi R, Cerrato G, Operti L, Gómez R, Bianchi CL. Comparative Photo-Electrochemical and Photocatalytic Studies with Nanosized TiO2 Photocatalysts towards Organic Pollutants Oxidation. Catalysts. 2021; 11(3):349. https://doi.org/10.3390/catal11030349 |
Resum: | The size of TiO2 can significantly affect both its photocatalytic and photo-electrochemical properties, thus altering the photooxidation of organic pollutants in air or water. In this work, we give an account of the photo-electrochemical and photocatalytic features of some nanosized TiO2 commercial powders towards a model reaction, the photooxidation of acetone. Cyclic voltammograms (CV) of TiO2 particulate electrodes under UV illumination experiments were carried out in either saturated O2 or N2 solutions for a direct correlation with the photocatalytic process. In addition, the effect of different reaction conditions on the photocatalytic efficiency under UV light in both aqueous and gaseous phases was also investigated. CV curves with the addition of acetone under UV light showed a negative shift of the photocurrent onset, confirming the efficient transfer of photoproduced reactive oxygen species (ROSs), e.g., hydroxyl radicals or holes to acetone molecules. The photocatalytic experiments showed that the two nano-sized samples exhibit the best photocatalytic performance. The different photoactivity of the larger-sized samples is probably attributed to their morphological differences, affecting both the amount and distribution of free ROSs involved in the photooxidation reaction. Finally, a direct correlation between the photocatalytic measurements in gas phase and the photo-electrochemical measurements in aqueous phase is given, thus evincing the important role of the substrate-surface interaction with similar acetone concentrations. |
Patrocinadors: | This work has been developed in part in the context of project RTI2018–102061–B–I00 financed by FEDER/Ministerio de Ciencia e Innovación-Agencia Estatal de Investigación. |
URI: | http://hdl.handle.net/10045/113628 |
ISSN: | 2073-4344 |
DOI: | 10.3390/catal11030349 |
Idioma: | eng |
Tipus: | info:eu-repo/semantics/article |
Drets: | © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
Revisió científica: | si |
Versió de l'editor: | https://doi.org/10.3390/catal11030349 |
Apareix a la col·lecció: | INV - GFES - Artículos de Revistas |
Arxius per aquest ítem:
Arxiu | Descripció | Tamany | Format | |
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Monllor-Satoca_etal_2021_Catalysts.pdf | 3,06 MB | Adobe PDF | Obrir Vista prèvia | |
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